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TOPSHOT - Accident investigators and rescue personnel work at the wreckage of a Junkers JU52 aircraft in Flims on August 5, 2018, after it crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP) / (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

TOPSHOT - Accident investigators and rescue personnel work at the wreckage of a Junkers JU52 aircraft in Flims on August 5, 2018, after it crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP) /         (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

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Accident investigators and rescue personnel gather around the wreckage of a Junkers JU52 aircraft at Flims on August 5, 2018, after the aeroplane crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP) (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

Accident investigators and rescue personnel gather around the wreckage of a Junkers JU52 aircraft at Flims on August 5, 2018, after the aeroplane crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP)        (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

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Accident investigators and rescue personnel work at the wreckage of a Junkers JU52 aircraft in Flims on August 5, 2018, after it crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP) (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

Accident investigators and rescue personnel work at the wreckage of a Junkers JU52 aircraft in Flims on August 5, 2018, after it crashed into Piz Segnas, a 3,000-metre (10,000-foot) peak in eastern Switzerland on August 4. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP)        (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

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FILED - ILLUSTRATION - 22 May 2017, Germany, Cologne: A historical Junkers Ju 52 plane flies over Cologne against the light. Up to 20 people have died in a plane crash in the Swiss Alps on Saturday. The plane that crashed in Canton Graubuenden was a Junkers Ju-52 built in 1939, according to an announcement on Sunday night by Ju-Air, a company specializing in sightseeing flights. Photo: Federico Gambarini/dpa (Photo by Federico Gambarini/picture alliance via Getty Images)

FILED - ILLUSTRATION - 22 May 2017, Germany, Cologne: A historical Junkers Ju 52 plane flies over Cologne against the light. Up to 20 people have died in a plane crash in the Swiss Alps on Saturday. The plane that crashed in Canton Graubuenden was a Junkers Ju-52 built in 1939, according to an announcement on Sunday night by Ju-Air, a company specializing in sightseeing flights. Photo: Federico Gambarini/dpa (Photo by Federico Gambarini/picture alliance via Getty Images)

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Hickers walk on August 5, 2018, as mountains where a Junkers JU52 aircraft crashed on August 4 above Flims are seen in the backround. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP) (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

Hickers walk on August 5, 2018, as mountains where a Junkers JU52 aircraft crashed on August 4 above Flims are seen in the backround. - Twenty people are confirmed dead after a vintage World War II aircraft crashed into a Swiss mountainside, police reports said. The Junker JU52 HB-HOT aircraft, built in Germany in 1939 and now a collectors item, belongs to JU-Air, a company with links to the Swiss air force, the ATS news agency reported. (Photo by Fabrice COFFRINI / AFP)        (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)